﻿ Python: Count the number of rows of a given SQLite table - w3resource

# Python: Count the number of rows of a given SQLite table

## Python SQLite Database: Exercise-8 with Solution

Write a Python program to count the number of rows of a given SQLite table.

Sample Solution:

Python Code :

``````import sqlite3
from sqlite3 import Error
def sql_connection():
try:
conn = sqlite3.connect('mydatabase.db')
return conn
except Error:
print(Error)

def sql_table(conn):
cursorObj = conn.cursor()
# Create the table
cursorObj.execute("CREATE TABLE salesman(salesman_id n(5), name char(30), city char(35), commission decimal(7,2));")
print("Number of records before inserting rows:")
cursor = cursorObj.execute('select * from salesman;')
print(len(cursor.fetchall()))
# Insert records
cursorObj.executescript("""
INSERT INTO salesman VALUES(5001,'James Hoog', 'New York', 0.15);
INSERT INTO salesman VALUES(5002,'Nail Knite', 'Paris', 0.25);
INSERT INTO salesman VALUES(5003,'Pit Alex', 'London', 0.15);
INSERT INTO salesman VALUES(5004,'Mc Lyon', 'Paris', 0.35);
INSERT INTO salesman VALUES(5005,'Paul Adam', 'Rome', 0.45);
""")
conn.commit()
print("\nNumber of records after inserting rows:")
cursor = cursorObj.execute('select * from salesman;')
print(len(cursor.fetchall()))

sqllite_conn = sql_connection()
sql_table(sqllite_conn)

if (sqllite_conn):
sqllite_conn.close()
print("\nThe SQLite connection is closed.")
``````

Sample Output:

```Number of records before inserting rows:
0

Number of records after inserting rows:
5

The SQLite connection is closed.
```

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿

## Python: Tips of the Day

How to make a chain of function decorators?

```from functools import wraps

def makebold(fn):
@wraps(fn)
def wrapped(*args, **kwargs):
return "<b>" + fn(*args, **kwargs) + "</b>"
return wrapped

def makeitalic(fn):
@wraps(fn)
def wrapped(*args, **kwargs):
return "<i>" + fn(*args, **kwargs) + "</i>"
return wrapped

@makebold
@makeitalic
def hello():
return "hello world"

@makebold
@makeitalic
def log(s):
return s

print hello()        # returns "<b><i>hello world</i></b>"
print hello.__name__ # with functools.wraps() this returns "hello"
print log('hello')   # returns "<b><i>hello</i></b>"
```

Ref: https://bit.ly/3cVz5iw